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DZero which then has a choice of Red or Quarq crankarms. No idea about either.
Quarq use exactly the same Exogram crank arms on all the DZero powermeters (Quarq DFour, Quarq DZero and SRAM RED DZero).
The only differences between Quarq DZero and SRAM RED DZero are that the Quarq branded ones are for use with normal chainrings (non-hidden bolt) and the SRAM branded ones are for use with SRAM hidden bolt type chainrings.
Go here and compare them side by side https://www.quarq.com/products-compare/
Matt101
Yeah, I don't really want to take cranks off another bike so I'd be buying the whole crankset. I'm trying to work out which is the best option though. DFour is for Shimano which means good but spendy chainrings and I'm not sure they do 36T outers for 9000/9100 so we veering towards the DZero which then has a choice of Red or Quarq crankarms. No idea about either.
I would be fitting new rings before this year's races anyway so need 110 bcd 34T 36T or similar. I might run a bigger outer for RaTN coz it's flat but I have that kind of stuff kicking around anyway or it's cheap.
Like, which of these... ? I dunno. They all look the same to me, save for the DZero/DFour choice and then crankarm difference.
https://www.sigmasports.com/brand/quarq#size%5B%5D=165mm110bcd&size%5B%5D=165mm&page=1&filters=%7B%7D